Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o nome abreviado do canal 5.5, KSTC-TV?
 ###Tabelas: CREATE TABLE career_titles_13 (career_titles_13_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date INT, Championship VARCHAR, Surface VARCHAR, Opponent in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE best_average_in_a_career (best_average_in_a_career_id AUTO_INCREMENT PRIMARY KEY, Matches INT, Innings INT, Not Out INT, High Score VARCHAR, Runs INT, Average INT) CREATE TABLE passengers_carried_in_2010 (passengers_carried_in_2010_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Airline VARCHAR, Country VARCHAR, Passengers Carried INT, Remarks VARCHAR, Alliance VARCHAR) CREATE TABLE digital_channels (digital_channels_id AUTO_INCREMENT PRIMARY KEY, Channel INT, Station VARCHAR, Video VARCHAR, Aspect VARCHAR, PSIP Short Name VARCHAR, Programming VARCHAR) CREATE TABLE legislation_sponsored_by_john_mccain (legislation_sponsored_by_john_mccain_id AUTO_INCREMENT PRIMARY KEY, Years covered VARCHAR, All bills sponsored INT, All amendments sponsored INT, All bills cosponsored INT, All amendments cosponsored INT, Bills originally cosponsored INT, Amendments originally cosponsored INT)  
SELECT PSIP Short Name FROM digital_channels WHERE Station = kstc-tv AND Channel = 5.5